From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Product data sheet and price list for Burgess Silencers, detailing their 'straight-through' design and application for air compressor intakes.
| Identifier | ExFiles\Box 152\3\ scan0092 | |
| Date | 2nd November 1932 guessed | |
| BURGESS SILENCERS [BRITISH MANUFACTURE] Silence the Noise without Power Loss BURGESS Silencers are designed on principles of muffling which are absolutely new in the art. The outstanding difference lies in the fact that the Burgess principle permits the flow of air or gases through the silencer without baffles or other obstructions and with no more resistance to flow than would be created with the equivalent length of straight pipe. Briefly described, the silencer consists of a perforated tube surrounded by a sound absorbing material, the whole enclosed in a suitable jacket or shell. Below: Phantom and cross section illustration showing "straight-through" construction. Left: End view showing clear opening "straight-through" the silencer. BURGESS SILENCERS FOR AIR COMPRESSOR INTAKES The silencers listed and described in this folder are for use on air compressor and blower intakes at low pressure lines and must not be used for hot exhaust gases or in the high pressure line between a compressor and its receiver. We manufacture mufflers and silencers for these uses and shall be glad to receive enquiries regarding them. The noise at the intake of an air compressor is an "air hammer." It is formed as the check valve in the cylinder suddenly closes during the piston stroke. Pulsations are set up which travel up the pipe against the air stream, and are heard as sounds when they reach the atmosphere. Small compressors have a "snoring noise." Large units have a heavy "thumping" noise. These are sound waves of low frequency. In some cases they are severe enough to rattle windows and cause a distinct head sensation. Sound absorbing material placed around the channel through which these waves must pass acts on them so that by the time the waves reach the atmosphere the magnitude of the pulsations is so reduced they are not objectionable. In many cases they are practically inaudible. Copyright : Released for publication by acknowledgment of source. --- The Burgess principle may be applied in all instances where noise is formed by moving or pulsating gases. Designs have been worked out in hundreds of cases, giving the gases an unrestricted straight path and at the same time destroying the sound present in the system. There are no baffles or spirals in Burgess Silencers. The gases travel through exactly as they do through a pipe line. If you have a special problem we invite your enquiries. PRICE LIST OF STANDARD DESIGNS AND SIZES [We also manufacture silencers of larger size and special designs. Write for special quotations.] [Diagram of a silencer with dimensions A, B, C, D, E marked] | Burgess Silencer No. | A Standard Pipe Nipple | B | C | D | E | Approx. Shipping Weight in Pounds | List Price £ s. d.{John DeLooze - Company Secretary} | |---|---|---|---|---|---|---|---| | C½ | ½" | 3¼ | 9 | 10 | ½ | 4 | 15 3 | | C¾ | ¾" | 3¼ | 12 | 13¼ | ¾ | 5 | 16 8 | | C1 | 1" | 3¼ | 15 | 17 | 1 | 6 | 18 0 | | C1¼ | 1¼" | 3¼ | 18 | 20¼ | 1¼ | 8 | 19 6 | | C1½ | 1½" | 3¼ | 20 | 23 | 1½ | 10 | 1 1 3 | | C2 | 2" | 4¼ | 32 | 35¼ | 1½ | 16 | 1 15 0 | | C2½ | 2½" | 5¼ | 32 | 36 | 2 | 20 | 2 2 6 | | C3 | 3" | 6 | 40 | 44¼ | 2½ | 35 | 3 10 0 | | C4 | 4" | 7 | 48 | 54 | 3 | 50 | 5 5 0 | | C5 | 5" | 9 | 48 | 54¼ | 3¼ | 75 | 9 7 6 | | C6 | 6" | 10 | 48 | 55¼ | 3¼ | 100 | 15 0 0 | | C8 | 8" | 12 | 60 | — | — | 150 | 25 0 0 | | C10 | 10" | 14 | 72 | — | To custom-ers Specifi-cation | 200 | 43 15 0 | | C12 | 12" | 17 | 96 | — | | 340 | 68 5 0 | | C14 | 14" | 20 | 108 | | | 520 | 100 0 0 | | C16 | See Note | 22 | 120 | — | | 700 | 131 5 0 | All silencers except C16 supplied with pipe nipples. Flanges extra. C16 supplied with standard 16" flanges. The dimensions shown in this folder are not guaranteed unless certified by the factory. To determine size required, use the Burgess number corresponding to the pipe size on the equipment. Where the pipe is a size between, use the next smaller silencer. DELIVERY: Sizes up to and including C6 can be supplied by return. Delivery of larger sizes can be made in approximately three weeks from receipt of complete specification. CARRIAGE: The above prices are carriage paid to any address in Great Britain, or f.o.b. any English port. Packing free. BURGESS SILENCERS ARE BRITISH Burgess Silencers are now produced entirely by British labour and capital in a well-equipped factory near Leicester. Noises formed by blowers of the rotary type may emerge with or against the air stream, depending on the operating conditions. The noise is formed by air rushing suddenly into the pockets which the blades form with each other and the casing, as they rotate. In all cases, by selecting a Burgess Silencer for the pipe size now on your installation, you will have in this silencer a straight opening equal to the inside area of your pipe line. No back pressure is caused by inserting a Burgess Silencer in the line. As far as restriction is concerned it will be the same as a similar length of that size pipe. For noise, however, it is a trap. The sound waves expand into the absorbing material and are destroyed, but there is no hindrance to the steady air flow to or from the compressor or blower. | ||